You used the size of the lemonade to argue its caffeine content was not excessive given the lemonade was larger in volume than a comparable coffee beverage.
But the topic of this chain started with the girl not realizing the drink was caffeinated to begin with.
The context of my question was calling into doubt the relevance of caffeine to volume ratio in defining “excessive” when the underlying issue was accidental consumption due to (alleged) poor product labeling.
Given she had a heart condition, any amount seems to have been “excessive”.